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Valorisation of Low-Grade Waste Heat Felix Ziegler | Institut für Energietechnik Vision: No useful heat flow without use!

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Presentation on theme: "Valorisation of Low-Grade Waste Heat Felix Ziegler | Institut für Energietechnik Vision: No useful heat flow without use!"— Presentation transcript:

1 Valorisation of Low-Grade Waste Heat Felix Ziegler | Institut für Energietechnik Vision: No useful heat flow without use!

2 Felix Ziegler | Institut für Energietechnik Options Absorption cooling Steam jet cycle Honigmann cycle Efficiency, and cost Valorisation of Low-Grade Waste Heat

3 Valorisation of low-grade waste heat | Felix Ziegler | 3 in out in out in out in out in out in out Temperature of heat flow upgraded: T 3 =120°C source: T 2 =80°C work : T cold: T 0 =5°C ambient: T 1 =35°C #1 #2 #3 #4 #5 High source: T 4 =180°C

4 Valorisation of low-grade waste heat | Felix Ziegler | 4 in out in out in out in out in out in out Temperature of heat flow upgraded: T 3 =120°C source: T 2 =80°C work : T cold: T 0 =-150°C ambient: T 1 =35°C High source: T 4 =180°C #1 #2 #3 #4 #5

5 Valorisation of low-grade waste heat | Felix Ziegler | 5 Cold is produced from heat Cold Drive Heat sink Single-effect absorption chiller

6 Valorisation of low-grade waste heat | Felix Ziegler | 6 Nominal cooling capacity 50kW

7 Valorisation of low-grade waste heat | Felix Ziegler | 7 =13K 40K Variation of driving t sink =30°C, V sink =3,8l/s, t cold =21/16°C Driving temperature in [°C] 0,9 l/s 0,6 l/s 0,3 l/s 0,1 l/s Cooling capacity [kW]

8 Valorisation of low-grade waste heat | Felix Ziegler | 8 Control: Minimisation of auxiliaries Control strategySEER el SEER th #1: Classic drive (Temperature) 130,75 #2: Heat sink (Temperature and flow rate) 190,75 #3: Drive (Temperature and flow rate) 140,75 #4: Combination (#2+#3) 220,75 Seasonal Energy Efficiency Ratio:

9 Valorisation of low-grade waste heat | Felix Ziegler | 9 Pressure Temperature Vapour pressure depression mechanical potential Water Aqueous Solution Liquid-Vapour-Equilibrium Honigmann cycle: storage and conversion of low-grade heat

10 Valorisation of low-grade waste heat | Felix Ziegler | 10 pressure temperature Charging (Heat!) pressure temperature Discharging (work!)

11 Valorisation of low-grade waste heat | Felix Ziegler | 11 Honigmann fireless locomotive (1883) Quelle: Mähr, Vergessene Erfindungen

12 Valorisation of low-grade waste heat | Felix Ziegler | 12 in out in out in out in out in out in out Temperature of heat flow upgraded: T 3 =120°C source: T 2 =80°C work : T cold: T 0 =5°C ambient: T 1 =35°C #1 #2 #3 #4 #5 High source: T 4 =180°C

13 Valorisation of low-grade waste heat | Felix Ziegler | 13

14 Valorisation of low-grade waste heat | Felix Ziegler | 14

15 Valorisation of Low-Grade Waste Heat Felix Ziegler | Institut für Energietechnik There are many challenging / promising options Efficient heat transfer is key to implementation

16 Valorisation of low-grade waste heat | Felix Ziegler | 16 Q 2 Q 1 Q 0 Steam ejector cycle Throttle Condenser Evaporator Boiler Pump Ejector

17 Valorisation of low-grade waste heat | Felix Ziegler | 17 combustion engine Steam jet cycle exhaust hx CAC RHX

18 Valorisation of low-grade waste heat | Felix Ziegler | 18

19 Valorisation of low-grade waste heat | Felix Ziegler | 19 1,0 l/s 3,8 l/s 2,0 l/s 1,5 l/s Heat sink temperature, inlet [°C] Cooling capacity [kW] P hydraulic = nominal =100% P hydraulic = 1/64*nominal = 1,5% Rückkühlvariationen t_FW=90°C, m_FW=0,9kg/s, t_KW=21/16°C

20 Valorisation of low-grade waste heat | Felix Ziegler | 20

21 Valorisation of low-grade waste heat | Felix Ziegler | 21 Flexible Be- und Entladung Nutzung von Abfallwärme Keine Selbstentladung Vorteile des Prozesses

22 Valorisation of low-grade waste heat | Felix Ziegler | 22 Single-effect absorption chiller A solution circulates between absorber A and regenerator G. In the Regenerator G it is regenerated, consuming the driving heat. The absorbed refrigerant is vaporised again. In the absorber it absorbs refrigerant vapour, rejecting heat.

23 Valorisation of low-grade waste heat | Felix Ziegler | 23 The refrigerant is liquefied in the absorber, rejecting heat...

24 Valorisation of low-grade waste heat | Felix Ziegler | 24 The vapour flows to the absorber, again....and is vapourised again in the evaporator, consuming heat (producing cold). The refrigerant is liquefied in the absorber, rejecting heat...


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